Submission #113496

#	Time	Username	Problem	Language	Result	Execution time	Memory
113496		Mamnoon_Siam	Combo (IOI18_combo)	C++17	100 / 100	55 ms	548 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;

string guess_sequence(int N) {
    string ret;
    set<char> r;
    r.insert('A');
    r.insert('B');
    r.insert('X');
    r.insert('Y');
    if(press("AB")) {
        if(press("A")) {
            ret += "A", r.erase('A');
        } else {
            ret += "B", r.erase('B');
        }
    } else {
        if(press("X")) {
            ret += "X", r.erase('X');
        } else {
            ret += "Y", r.erase('Y');
        }
    }
    if(N == 1) return ret;
    vector<int> R(r.begin(), r.end());
    for(int i = 2; i < N; i++) {
        string tmp;
        tmp += ret;
        tmp += R[0];
        for(char ch : R) {
            tmp += ret;
            tmp += R[1];
            tmp += ch;
        }
        int rep = press(tmp);
        if(rep == ret.size()) ret += R[2];
        else if(rep == ret.size() + 1) ret += R[0];
        else ret += R[1];
    }
    for(int k = 0; k < 2; k++) {
        char ch = R[k];
        string tmp = ret;
        tmp += ch;
        if(press(tmp) == N) {
            ret += ch;
            break;
        }
    }
    if(ret.size() != N) {
        ret += R[2];
    }
    return ret;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:37:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if(rep == ret.size()) ret += R[2];
      |            ~~~~^~~~~~~~~~~~~
combo.cpp:38:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         else if(rep == ret.size() + 1) ret += R[0];
      |                 ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:50:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   50 |     if(ret.size() != N) {
      |        ~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95